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4890e53977
[auth2-none.c sshd_config sshd_config.5]
Support "Banner=none" to disable displaying of the pre-login banner;
ok dtucker@ deraadt@
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/* $OpenBSD: auth2-none.c,v 1.14 2007/08/23 03:22:16 djm Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <string.h>
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#include "xmalloc.h"
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#include "key.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "packet.h"
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#include "log.h"
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#include "buffer.h"
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#include "servconf.h"
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#include "atomicio.h"
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#include "compat.h"
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#include "ssh2.h"
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#ifdef GSSAPI
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#include "ssh-gss.h"
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#endif
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#include "monitor_wrap.h"
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/* import */
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extern ServerOptions options;
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/* "none" is allowed only one time */
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static int none_enabled = 1;
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char *
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auth2_read_banner(void)
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{
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struct stat st;
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char *banner = NULL;
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size_t len, n;
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int fd;
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if ((fd = open(options.banner, O_RDONLY)) == -1)
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return (NULL);
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if (fstat(fd, &st) == -1) {
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close(fd);
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return (NULL);
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}
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if (st.st_size > 1*1024*1024) {
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close(fd);
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return (NULL);
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}
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len = (size_t)st.st_size; /* truncate */
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banner = xmalloc(len + 1);
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n = atomicio(read, fd, banner, len);
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close(fd);
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if (n != len) {
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xfree(banner);
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return (NULL);
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}
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banner[n] = '\0';
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return (banner);
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}
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void
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userauth_send_banner(const char *msg)
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{
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if (datafellows & SSH_BUG_BANNER)
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return;
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packet_start(SSH2_MSG_USERAUTH_BANNER);
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packet_put_cstring(msg);
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packet_put_cstring(""); /* language, unused */
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packet_send();
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debug("%s: sent", __func__);
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}
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static void
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userauth_banner(void)
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{
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char *banner = NULL;
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if (options.banner == NULL ||
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strcasecmp(options.banner, "none") == 0 ||
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(datafellows & SSH_BUG_BANNER) != 0)
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return;
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if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
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goto done;
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userauth_send_banner(banner);
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done:
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if (banner)
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xfree(banner);
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}
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static int
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userauth_none(Authctxt *authctxt)
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{
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none_enabled = 0;
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packet_check_eom();
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userauth_banner();
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#ifdef HAVE_CYGWIN
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if (check_nt_auth(1, authctxt->pw) == 0)
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return (0);
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#endif
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if (options.password_authentication)
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return (PRIVSEP(auth_password(authctxt, "")));
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return (0);
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}
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Authmethod method_none = {
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"none",
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userauth_none,
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&none_enabled
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};
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